<?php
namespace Org\Util;
/**
 * Frame/Library/Org/Util/Pages.class.php 软盟bootstrap定制分页类
 * 
 * @author mcyami	mcyami@gmail.com
 * @version 20140111
 */
class Pages {
	public $firstRow; // 起始行数
	public $listRows; // 列表每页显示行数
	public $parameter; // 分页跳转时要带的参数
	public $totalRows; // 总行数
	public $totalPages; // 分页总页面数
	public $rollPage = 11; // 分页栏每页显示的页数
	public $lastSuffix = true; // 最后一页是否显示总页数
	

	private $p = 'p'; //分页参数名
	private $url = ''; //当前链接URL
	private $nowPage = 1;
	
	// 分页显示定制
	private $config = array (
			'header' => '共 %TOTAL_ROW% 条', 
			'prev' => '&lt;', 
			'next' => '&gt;', 
			'first' => '1...', 
			'last' => '...%TOTAL_PAGE%', 
			'theme' => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END% %HEADER%',
	);
	
	/**
	 * 架构函数
	 * @param array $totalRows  总的记录数
	 * @param array $listRows  每页显示记录数
	 * @param array $parameter  分页跳转的参数
	 */
	public function __construct($totalRows, $listRows=10, $parameter = array()) {
		if (C ( 'VAR_PAGE' )) {
			$this->p = C ( 'VAR_PAGE' ); //设置分页参数名称
		}
		/* 基础设置 */
		$this->totalRows = $totalRows; //设置总记录数
		$this->listRows = $listRows; //设置每页显示行数
		$this->parameter = empty ( $parameter ) ? $_GET : $parameter;
		$this->nowPage = empty ( $_GET [$this->p] ) ? 1 : intval ( $_GET [$this->p] );
		$this->firstRow = $this->listRows * ($this->nowPage - 1);
	}
	
	/**
	 * 定制分页链接设置
	 * @param string $name  设置名称
	 * @param string $value 设置值
	 */
	public function setConfig($name, $value) {
		if (isset ( $this->config [$name] )) {
			$this->config [$name] = $value;
		}
	}
	
	/**
	 * 生成链接URL
	 * @param  integer $page 页码
	 * @return string
	 */
	private function url($page) {
		return str_replace ( urlencode ( '[PAGE]' ), $page, $this->url );
	}
	
	/**
	 * 组装分页链接
	 * @return string
	 */
	public function show() {
		if (0 == $this->totalRows){
			return '';
		}
		/* 生成URL */
		$this->parameter [$this->p] = '[PAGE]';
		$this->url = U ( ACTION_NAME, $this->parameter );
		/* 计算分页信息 */
		$this->totalPages = ceil ( $this->totalRows / $this->listRows ); //总页数
		if (! empty ( $this->totalPages ) && $this->nowPage > $this->totalPages) {
			$this->nowPage = $this->totalPages;
		}
		
		/* 计算分页零时变量 */
		$now_cool_page = $this->rollPage / 2;
		$now_cool_page_ceil = ceil ( $now_cool_page );
		$this->lastSuffix && $this->config ['last'] = $this->totalPages;
		
		//上一页
		$up_row = $this->nowPage - 1;
		if ($this->totalPages <= 1){
			$up_page = '';
		} else {
			if ( $up_row > 0 ) {
				$up_page = '<li><a class="prev" href="' . $this->url ( $up_row ) . '">' . $this->config ['prev'] . '</a></li>';
			} else {
				$up_page = '<li class="prev disabled"><a class="prev" href="#">' . $this->config ['prev'] . '</a></li>';
			}
		}
		
		//下一页
		$down_row = $this->nowPage + 1;
		if ($this->totalPages <= 1){
			$down_page = '';
		} else {
			if ($down_row <= $this->totalPages) {
				$down_page = '<li><a class="next" href="' . $this->url ( $down_row ) . '">' . $this->config ['next'] . '</a></li>';
			} else {
				$down_page = '<li class="disabled"><a class="next" href="#">' . $this->config ['next'] . '</a></li>';
			}
		}
		
		//第一页
		$the_first = '';
		if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
			$the_first = '<li><a class="first" href="' . $this->url ( 1 ) . '">' . $this->config ['first'] . '</a></li>';
		}
		
		//最后一页
		$the_end = '';
		if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
			$the_end = '<li><a class="end" href="' . $this->url ( $this->totalPages ) . '">' . $this->config ['last'] . '</a></li>';
		}
		
		//数字连接
		$link_page = "";
		for($i = 1; $i <= $this->rollPage; $i ++) {
			if (($this->nowPage - $now_cool_page) <= 0) {
				$page = $i;
			} elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
				$page = $this->totalPages - $this->rollPage + $i;
			} else {
				$page = $this->nowPage - $now_cool_page_ceil + $i;
			}
			if ($page > 0 && $page != $this->nowPage) {
				if ($page <= $this->totalPages) {
					$link_page .= '<li><a class="num" href="' . $this->url ( $page ) . '">' . $page . '</a></li>';
				} else {
					break;
				}
			} else {
				if ($page > 0 && $this->totalPages != 1) {
					$link_page .= '<li class="active"><a class="num" href="' . $this->url ( $page ) . '">' . $page . '</a></li>';
				}
			}
		}
		//替换分页内容
		if ($this->totalPages <= 1){
			$page_str = '';
		}else{
			$page_str = str_replace ( 
				array ('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%' ), 
				array ('<li><span class="rows">'.$this->config ['header'].'</span></li>', $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages ), 
				$this->config ['theme'] 
			);
		}
		return "<ul class=\"pagination\" style=\"visibility: visible;\">{$page_str}</ul>";
	}
}
